Compact Vehicle Torque Distribution Layout for Limited Chassis Space
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Solution Overview
Problem
Heavy-duty special vehicles, such as fire-fighting, military, or rescue vehicles, face challenges in torque distribution due to limited space and the need for a high operating range, especially in hybrid vehicles where transmission elements occupy valuable space.
Innovation Solution
A compact torque distribution system is designed to provide torque in a high operating range, featuring an 'H' shaped configuration with branches extending along parallel axes, connecting to an axle and incorporating electric machines, differential systems, and independent suspension to ensure versatile torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission elements are housed in the space between spars, then torque distribution capability is improved, but useful space of the vehicle is reduced
Solution Approach 1:
The differential unit is nested within the housing that is positioned between the spars of the chassis. The housing serves dual purposes: it contains the transmission elements (differential unit, electric machines) and simultaneously acts as a structural component of the chassis. This nesting arrangement allows the transmission system to be accommodated within the limited space between spars without further reducing the useful space of the vehicle.
Solution Approach 2:
The housing between spars serves multiple functions: it houses the differential unit and electric machines for torque distribution, provides structural support for the chassis, and maintains the integrity of the vehicle frame. By making this component multi-functional, the patent avoids adding separate housings that would further reduce useful space.
2Area of stationary object
If a compact torque distribution system is designed, then useful space is preserved, but torque distribution range may be limited
Solution Approach 1:
The torque distribution system is segmented into independent differential units, each capable of independently distributing torque to its respective wheels. Each differential unit can be controlled separately, allowing the system to provide high operating range torque distribution while maintaining a compact overall structure. The segmentation enables versatile torque control without requiring a large centralized transmission system.
Solution Approach 2:
The system incorporates electric machines that can dynamically adjust torque distribution in real-time based on operating conditions. The differential units can adapt their torque split ratios dynamically, enabling the compact system to achieve high operating range and versatility comparable to larger traditional systems. The dynamic control compensates for the reduced physical size.
Data Source
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AI summary
A vehicle (1) of a special type comprising a chassis (2) movable on the ground via a plurality of wheels (8), the chassis comprising a pair of spars (3', 3") extending parallel to a longitudinal axis (A) of vehicle (1), vehicle (1) comprising an engine module (5) configured to provide torque to the plurality of wheels (8) and a distribution system (7) operationally connected between engine module (5) and the plurality of wheels (8) to distribute the torque, distribution system (7) comprising an axle (6) and a first and a second branch (7', 7"), axle (6) comprising a pair of drive axles (27', 21'') operationally connected to an input shaft (13) driven by engine module (5), first and second branches (7', 7") each driven by a respective one of drive axles (27', 21''), and extending along respective axes (A', A") parallel to and spaced from the longitudinal axis (A) and each being placed adjacent to and internally with respect to a respective spar (3', 3").